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one thing i would immediately suspect is any other access points in your area. if you have another one around you, it is most likely ont he default channel 6, and a quick fix in this scenerio would be to switch the operating channel on your router to something like 3, 9 or 1 (the further away actually makes the frequency difference greater).
the next assumption is a cordless phone. if you have a cordless phone in your place,a nd it is a 2.4 GHz phone, if it is anywhere between the router and one of the wireless computers, it will instantly kill the signal anytime it rings, and sometimes the interfearence will prevent the card from regainnign a connection until the card is disabled or re enabled (the same effect as rebooting).
another possibility is any metal rebar in the walls between the access point and compuer. along with that is flourescent lights in the signal path. also, it could be as simple as the power saving feature in the card kicking in due to periodic inactivity, screensaver mode, standby, etc. my girlfriend's computer is in the back of the apartment, and whenever her screensaver kicks on and she goes back to her desktop, she has to run a repair on the connection in order for it to get network connectivity back, even though she had not lost her ip address or the dhcp lease. i would assume you're probably running windows xp professional, as this is a setting in the group policy in service pack 1+ machines which causes this behaviour.
lastly, you may want to check if your router has a firmware update addressing this issue, or if any of your network cards also have updates for it. it's a good idea to update the router's firmware anyway, so even if you fix the problem with one of the other suggestions, you should do this one anyway. the linksys site should ahve good instructions how to do it.
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